From patchwork Fri Dec 11 18:46:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11969331 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.2 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CB07FC4361B for ; Fri, 11 Dec 2020 20:25:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 766872074B for ; Fri, 11 Dec 2020 20:25:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2394097AbgLKStU (ORCPT ); Fri, 11 Dec 2020 13:49:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56254 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2406353AbgLKSss (ORCPT ); Fri, 11 Dec 2020 13:48:48 -0500 Received: from mail-qk1-x74a.google.com (mail-qk1-x74a.google.com [IPv6:2607:f8b0:4864:20::74a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5CEFBC061A49 for ; Fri, 11 Dec 2020 10:47:00 -0800 (PST) Received: by mail-qk1-x74a.google.com with SMTP id p13so1040288qki.14 for ; Fri, 11 Dec 2020 10:47:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=2x/zjVn7tqzzMwlgW94lOF/53GHge2qEfxVssZKSVKU=; b=sVh7pgdYPbhuziZ7RbVkNdr73qN77YcUUWXTQ1tAb3P7jqHRr2p1f5bPxlsX3TaJ0x NLRx4jH9CypSCESRGLRonyZ8+kkS3XNyERw+CW+BqWmKtawr0ILqseYbrw/qx5wrEH2B VqZ0x9qFDwfElGwb1vEdm1fnMLextKeSpBRqwLQXUche0e5kuofl1+h4UoBzhPS5Diu4 EguLuAaf07YUp6KSWi5vK+lTKN+85JJaMCLDLqfd6UvMg+GduXve9RFsPVLp74nssXU5 7G5z+jbgJYyIgkNTgNx96jpD1psInPt090dZnr/BEIQ4zT7bqAbfJUIq9iNE+/XzJIVu 6Ing== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=2x/zjVn7tqzzMwlgW94lOF/53GHge2qEfxVssZKSVKU=; b=LfnNgxgUkpE5RSm4kmWAXKME9Hvfca+aWCE0TU2ACyQ4PfNn0bIUNzbl+pFL/WKSWQ kt4mYleuDjbUM1ZpxriCoHB9lDdQNxTrhy2Slh+otSp4EE9NeMVPqHp6EnzjdQ9ZJQPg j8prqDT2HtwNWkfuMk55Bz3wmFBHSh4OYKAsddGJ4bxc3NQbPKnlQ4J5CFbeKpLN0mr5 sm4QGxxUbDdgAMIXXIcL6140SPm7p9x+OQt8PwVPkoEq7qbxfo8gGTdBpeZo42yinQ46 LTSk0U/8mswc17ZIMHNqpJS4qLltOsLJw0QHHGR6k7bT5VZYCS5QUio5g9gnUJpqGka6 qZeA== X-Gm-Message-State: AOAM533bzsH8Xdm0Zx3JbGmRe5E5qxPpyhSpTHsjtoZvfs7h9e6bL0VD bS+6JTeDVB61rlsrLDKmKozKAEnjrgTtu08HbiQ= X-Google-Smtp-Source: ABdhPJy6JuT0I8NnXRzTs2o4vn7H7iL4bg1V2c7l8tXurWBfldv/1YSed2IdWjWnqXB3B13fccdvqEaMosao7evXpYA= Sender: "samitolvanen via sendgmr" X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a05:6214:a94:: with SMTP id ev20mr17352143qvb.56.1607712419531; Fri, 11 Dec 2020 10:46:59 -0800 (PST) Date: Fri, 11 Dec 2020 10:46:29 -0800 In-Reply-To: <20201211184633.3213045-1-samitolvanen@google.com> Message-Id: <20201211184633.3213045-13-samitolvanen@google.com> Mime-Version: 1.0 References: <20201211184633.3213045-1-samitolvanen@google.com> X-Mailer: git-send-email 2.29.2.576.ga3fc446d84-goog Subject: [PATCH v9 12/16] efi/libstub: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Steven Rostedt , Will Deacon Cc: Josh Poimboeuf , Peter Zijlstra , Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , Nick Desaulniers , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Sami Tolvanen Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org With CONFIG_LTO_CLANG, we produce LLVM bitcode instead of ELF object files. Since LTO is not really needed here and the Makefile assumes we produce an object file, disable LTO for libstub. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- drivers/firmware/efi/libstub/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile index 8a94388e38b3..c23466e05e60 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -38,6 +38,8 @@ KBUILD_CFLAGS := $(cflags-y) -Os -DDISABLE_BRANCH_PROFILING \ # remove SCS flags from all objects in this directory KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS)) +# disable LTO +KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO), $(KBUILD_CFLAGS)) GCOV_PROFILE := n # Sanitizer runtimes are unavailable and cannot be linked here.